The victims and the shooter were involved in a fight inside the restaurant in the 800-block of West Jackson Boulevard when shots were fired.
A 31-year-old man was wounded in the chest and transported to Stroger Hospital in serious condition and a 26-year-old woman suffered a graze wound to her right foot and refused treatment at the scene.
Police said the shooter, a 26-year-old man, was wounded in the left leg and transported to Stroger Hospital. Police said the 26-year-old shot himself.
Sun-Times Media Wire contributed to this report